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Fatigue life prediction of filled polypropylene based on creep rupture
Author(s) -
Trantina Gerald G.
Publication year - 1984
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760241507
Subject(s) - polypropylene , materials science , creep , talc , composite material , stress (linguistics) , waveform , constant (computer programming) , cyclic stress , voltage , electrical engineering , philosophy , linguistics , computer science , programming language , engineering
To predict the fatigue performance of talc‐filled polypropylene in engineering applications, a simple relationship using constant stress data to predict the cycles‐to‐failure ( N f ) was developed:\documentclass{article}\pagestyle{empty}\begin{document}$$ N_f = kv\sigma ^{ - n} f(n) $$\end{document}where k and n are constants from creep rupture tests, v is the cyclic frequency (≤1 Hz to avoid self‐heating), f ( n ) is a function that accounts for the wave form, and a is the peak cyclic stress with a zero minimum stress. For stress concentrations produced by central holes, σ is taken as the average net section stress and the effect of the stress concentration is ignored. Extensive tests were used to verify this expression for cyclic frequencies of 1.0 and 0.1 Hz, sinusoidal and triangular waveforms, stress concentrations produced by small and large holes, and 20 and 40 percent talc filler content.